Or Angular, if caring about Google

Your comparison is like comparing The Eagles to some little local rock band!

Rather than two competitive products I think React and Kube are both market dominant products that reveal the engineering culture, values and impact of the two organizations.

I can say that when I first started with React I thought it sucked and looked at Vue and Svelte and similar things. My take on all of them was that they made the internal frameworks I was using to build very complex RIAs in the 2005-2010 time frame look like something that fell off a UFO.

I first thought Vue reflected the way I thought about conventional "webby" applications particularly in terms of treating lists as a first-class object. I eventually learned with React how to draw absolutely anything, even whole 3-d worlds!

https://aframe.io/

I guess what I'll say about Svelte is "if you make such a radical change in your framework did you really believe in it?" Early on I stuck to controlled forms in React because uncontrolled forms seemed structurally unstable (add one too many features and it all breaks) and then I discovered

https://react-hook-form.com/

which is easy and very high performing. What I really like about React is not so much the DX or UX but rather the way it uses functions to seemingly transform a language into something else in a conceptually simple way... And how it solves the problem of composing components written by different people and organizations to the extent that we've now got the terrible problem of managing an app that has 50 third party components and 5 CSS management frameworks.